2.30 In the circuit of Fig. P2.30 let Vcc = 12 V, V, = 6 V, R, = 33 kN, R, = 3.0 kN, and R, = 2.0 kN. Moreover, let BrI 0.7 V, and VECI(sa) = VCE2sa) = 0.1 V. (a) Find R, so that I = 1.5 mA. (b) Look at your calculations again, and identify the = Bm = 50, VERI(on) = VR BE2(on) cases in which base currents could have been ignored to speed up calculations, and those in which they couldn't. Recalculate using these approximations, compare, and comment. Vcc R13 R2 Qi V1 Q2 R3 RA FIGURE P2.30

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2.30
2.30 In the circuit of Fig. P2.30 let Vcc = 12 V, V, =
6 V, R, = 33 kN, R, = 3.0 kN, and R, = 2.0 kN.
Moreover, let Bfi = Br2 = 50, VEBI(on) = VBE2(on)
0.7 V, and Veci(sat)
(a) Find R, so that Ic = 1.5 mA.
(b) Look at your calculations again, and identify the
VCE2(sa) = 0.1 V.
cases in which base currents could have been
ignored to speed up calculations, and those in
which they couldn’t. Recalculate using these
approximations, compare, and comment.
Vcc
R1
R2
Qi
Q2
V1
S R3
RA
FIGURE P2.30
Transcribed Image Text:2.30 In the circuit of Fig. P2.30 let Vcc = 12 V, V, = 6 V, R, = 33 kN, R, = 3.0 kN, and R, = 2.0 kN. Moreover, let Bfi = Br2 = 50, VEBI(on) = VBE2(on) 0.7 V, and Veci(sat) (a) Find R, so that Ic = 1.5 mA. (b) Look at your calculations again, and identify the VCE2(sa) = 0.1 V. cases in which base currents could have been ignored to speed up calculations, and those in which they couldn’t. Recalculate using these approximations, compare, and comment. Vcc R1 R2 Qi Q2 V1 S R3 RA FIGURE P2.30
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